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Know Your Eye Conditions

Focusing Problems

Posted on October 6, 2016 Share

These eye conditions could be due to refractive errors which happen when the eye does not bend or refract light onto a single focusing point, resulting in blurred vision.

Myopia, or shortsightedness, is the most common refractive error of the eye. In myopia, the image the eye receives is not clear because the light rays come to focus before they reached the retina.

If you are shortsighted, you will be able to see well for close-up tasks such as reading, but have difficulty reading road signs and seeing distant objects clearly.

myopia

 

Hyperopia, or longsightedness,is a common focusing problem which occurs when the focal point of a visual image falls behind the retina instead of directly on it.

If you are longsighted, you may be able to see distant objects well but have difficulty focusing on near objects.

hyperopia

Astigmatism (“San Guang”) is also a refractive error where problem lies in how the eye focuses light. This happens when the light fails to come to a single focus on the retina due to the irregular shape of the cornea.

If you have Astigmatism, your vision would likely be blurred or distorted to a certain degree at all distances.

 astig

Presbyopia, also known “Lao Hua”(“ageing eye”), is an age-related eye condition which usually occurs beginning around age 40. This happens when the lens is not able to change its shape as it grows larger with age. Thus, it loses its elasticity and ability to focus on near objects.

If you are starting to have presbyopia, you will find yourself holding reading materials like books and magazines further away in order to read clearly.

presbyopia

 

Symptoms

Myopia (shortsightedness) can cause the following:

  • difficulty reading road signs
  • difficulty in seeing distant objects clearly

Common signs of Hyperopia are:

  • eyes tension, ache or fatigue
  • blurry vision close up
  • squinting of eyes to see better

Astigmatism (“San Guang”) can cause the following:

  • blurry, distorted, or fuzzy vision at all distances (close-up and far away)
  • difficulty seeing at night
  • eyestrain or headaches
  • squinting

Common signs of Presbyopia (“ageing eye”):

  • holding reading materials e.g. book further away so as to read clearly
  • difficulty in reading small print
  • eyestrain or headaches

Treatment

In the early stages, glasses or soft contact lenses can be used to correct the shortsightedness and astigmatism. As the disorder progresses, vision deteriorates, the cornea continues to thin, and rigid gas permeable contact lenses may be needed to correct vision. In advanced cases, a corneal transplant may be necessary to replace the damaged cornea.

Cataract treatment is also known to treat Presbyopia. Contact us at W Optics to find out more about our public forums available.

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